add lec09 content

_announcements/general.md

@@ -1,7 +1,7 @@
 ---
 title: Week 4 Announcements
 week: 4
-date: 2024-02-03
+date: 2024-02-05
 ---
 
 * Link to Week 4 [here](https://www.data8.org/sp24/index.html#week-4)

_modules/week-04.md

@@ -6,7 +6,7 @@ status: Active
 
 Feb 5
 : **9 (Sahai)**{: .label} Functions
- <!-- : [Slides](#) &#8226; [Demos](#) &#8226; [Blank Demos](#) -->
+   : [Slides](https://docs.google.com/presentation/d/1RT9NealaPB3FnVRBXFZAeqjO8VVhoJ8VXfxTAT1Yrr4/edit?usp=sharing) &#8226; [Demos](https://data8.datahub.berkeley.edu/hub/user-redirect/git-pull?repo=https%3A%2F%2Fgithub.com%2Fdata-8%2Fmaterials-sp24&urlpath=tree%2Fmaterials-sp24%2Flec%2Flec09%2Flec09.ipynb&branch=main)
 : *Reading:* [8](https://inferentialthinking.com/chapters/08/Functions_and_Tables.html), [8.1](https://inferentialthinking.com/chapters/08/1/Applying_a_Function_to_a_Column.html)
 : **Lab**{: .label .label-lab} Lab 04: Functions and Visualization (Due 2/9)
  : Lab 04 Worksheet